Transition Metal Dynamics in Lithium-Ion Battery Systems

Transition metal dynamics in lithium-ion batteries encompass the dissolution, migration and interfacial reactions of metal ions such as manganese, nickel and cobalt derived from cathode materials. These processes critically influence capacity retention, cycle life and safety of cells. Under high-voltage operation or extended cycling, layered oxides release soluble metal species into the electrolyte. Once mobile, these ions can deposit on the anode, catalyse electrolyte decomposition and alter the composition and mechanical properties of the solid electrolyte interphase. Concurrently, accumulated metal ions at the cathode/electrolyte interface contribute to structural degradation and impedance growth. Understanding these coupled phenomena has driven the development of advanced interphases, tailored electrolytes and diagnostic methodologies. Recent advances have elucidated the solvation environment of transition metal cations, the formation of robust inorganic-rich interphases and the mechanistic pathways by which metal-induced cross-talk accelerates capacity fade. These insights underpin strategies to mitigate metal dissolution, including the design of concentrated salt formulations that foster protective LiF-rich interfaces, as well as electrolyte additives that scavenge dissolved ions and suppress parasitic reactions. The global significance of this research lies in extending the lifetime and reliability of high-energy battery technologies for electric vehicles, grid storage and portable electronics.

Research from Nature Portfolio

Two seminal studies have advanced the control of transition metal dissolution and elucidated the broader impacts of soluble ions on electrolyte stability. One report demonstrated that a high-concentration electrolyte forms a uniform, LiF-rich cathode electrolyte interphase that markedly inhibits transition metal leaching from cobalt-free lithium-rich cathodes, thereby improving Coulombic efficiency and cycling resilience. Another investigation revealed that manganese(II) cations in the bulk electrolyte destabilise carbonate solvents and PF6− anions via a unique solvation sheath, catalysing continuous electrolyte decomposition and exacerbating capacity loss. Together, these findings highlight the dual necessity of designing both interphase chemistry and solvent environments to arrest metal migration and preserve cell performance.

Transition Metal Dynamics in Lithium-Ion Battery Systems publication trend

The graph below shows the total number of articles in transition metal dynamics in lithium-ion battery systems across all publications each year (not limited to Nature Index journals).

Technical terms

Transition metal dissolution: The leaching of metal ions (e.g., Mn, Ni, Co) from cathode materials into the electrolyte during battery operation.

Solid electrolyte interphase (SEI): A passivating film formed on the anode surface that regulates lithium-ion transport and prevents continuous electrolyte breakdown.

Cathode electrolyte interphase (CEI): A protective layer that forms at the cathode/electrolyte interface, influencing metal dissolution and electrode stability.

Solvation sheath: The layer of solvent molecules and anions coordinating a dissolved ion, dictating its reactivity and transport properties.

Coulombic efficiency: The ratio of charge extracted to charge inserted per cycle, indicative of reversible capacity and parasitic losses.

References

1. Transition Metal Dissolution, Ion Migration, Electrocatalytic Reduction and Capacity Loss in Lithium-Ion Full Cells. Journal of The Electrochemical Society (2017).
2. Effects of Dissolved Transition Metals on the Electrochemical Performance and SEI Growth in Lithium-Ion Batteries. Journal of The Electrochemical Society (2014).
3. Understanding Degradation at the Lithium-Ion Battery Cathode/Electrolyte Interface: Connecting Transition-Metal Dissolution Mechanisms to Electrolyte Composition. ACS Applied Materials & Interfaces (2021).
4. Inhibition of transition metals dissolution in cobalt-free cathode with ultrathin robust interphase in concentrated electrolyte. Nature Communications (2020).
5. Overlooked electrolyte destabilization by manganese (II) in lithium-ion batteries. Nature Communications (2019).
6. Review: mechanisms and consequences of chemical cross-talk in advanced Li-ion batteries. Journal of Physics Energy (2020).
7. Cycle-Induced Interfacial Degradation and Transition-Metal Cross-Over in LiNi0.8Mn0.1Co0.1O2–Graphite Cells. Chemistry of Materials (2022).